Gel cassette



FIG. 1 is a perspective view of a gel cassette showing our new design;

FIG. 2 is a front view of a gel cassette shown in FIG. 1;

FIG. 3 is a plan view of a gel cassette shown in FIG. 1;

FIG. 4 is an inverted plan view of a gel cassette shown in FIG. 1;

FIG. 5 is a rear view of a gel cassette shown in FIG. 1; and,

FIG. 6 is a side view of a gel cassette shown in FIG. 1. 

The ornamental design for a gel cassette, as shown and described. 